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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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 *

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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

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 * 2 along with this work; if not, write to the Free Software Foundation,

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/*

 * @test TestSummarizeRSetStatsThreads

 * @bug 8025441

 * @summary Ensure that various values of worker threads/concurrent

 * refinement threads do not crash the VM.

 * @key gc

 * @library /testlibrary

 */

import java.util.regex.Matcher;

import java.util.regex.Pattern;

import com.oracle.java.testlibrary.ProcessTools;

import com.oracle.java.testlibrary.OutputAnalyzer;

public class TestSummarizeRSetStatsThreads {

  private static void runTest(int refinementThreads, int workerThreads) throws Exception {

    ProcessBuilder pb = ProcessTools.createJavaProcessBuilder("-XX:+UseG1GC",

                                                              "-XX:+UnlockDiagnosticVMOptions",

                                                              "-XX:+G1SummarizeRSetStats",

                                                              "-XX:G1ConcRefinementThreads=" + refinementThreads,

                                                              "-XX:ParallelGCThreads=" + workerThreads,

                                                              "-version");

    OutputAnalyzer output = new OutputAnalyzer(pb.start());

    // check output to contain the string "Concurrent RS threads times (s)" followed by

    // the correct number of values in the next line.

    // a zero in refinement thread numbers indicates that the value in ParallelGCThreads should be used.

    // Additionally use at least one thread.

    int expectedNumRefinementThreads = refinementThreads == 0 ? workerThreads : refinementThreads;

    expectedNumRefinementThreads = Math.max(1, expectedNumRefinementThreads);

    // create the pattern made up of n copies of a floating point number pattern

    String numberPattern = String.format("%0" + expectedNumRefinementThreads + "d", 0)

      .replace("0", "\\s+\\d+\\.\\d+");

    String pattern = "Concurrent RS threads times \\(s\\)$" + numberPattern + "$";

    Matcher m = Pattern.compile(pattern, Pattern.MULTILINE).matcher(output.getStdout());

    if (!m.find()) {

      throw new Exception("Could not find correct output for concurrent RS threads times in stdout," +

        " should match the pattern \"" + pattern + "\", but stdout is \n" + output.getStdout());

    }

    output.shouldHaveExitValue(0);

  }

  public static void main(String[] args) throws Exception {

    if (!TestSummarizeRSetStatsTools.testingG1GC()) {

      return;

    }

    // different valid combinations of number of refinement and gc worker threads

    runTest(0, 0);

    runTest(0, 5);

    runTest(5, 0);

    runTest(10, 10);

    runTest(1, 2);

    runTest(4, 3);

  }

}